Note: The job is a remote job and is open to candidates in USA. Fireblocks is a leading platform for digital assets, providing secure solutions for companies to work with blockchain technology. The Mobile Engineer will design and implement high-quality native mobile SDKs, focusing on API ergonomics, performance, and reliability, while also ensuring the security and reliability of wallet operations.
Responsibilities
- Design and implement high-quality native mobile SDKs that enable developers to integrate embedded wallet functionality into their applications, with a strong focus on API ergonomics, performance, and reliability
- Own SDK features end-to-end: from API design and architecture, through implementation and testing, to release, versioning, and developer documentation
- Build and maintain secure, reliable SDK components for wallet operations, including cryptographic operations, blockchain interactions, and security-sensitive flows
- Define and evolve the SDK architecture to support long-term maintainability, backward compatibility, and adoption across diverse customer applications
- Build sample applications and demos that showcase SDK capabilities and serve as integration references for customers
- Create clear, comprehensive SDK documentation and integration guides
- Work with developer relations and support teams to address customer integration challenges
- Raise the bar for quality and operational excellence by establishing best practices around testing, observability, releases, and code health
- Contribute to a culture of ownership and execution, leading by example through hands-on work, code reviews, documentation, and knowledge sharing
Skills
- 5+ years of software engineering experience, with deep focus on mobile development and shipping production-grade SDKs
- Demonstrated track record of building and shipping high-quality code, with work you can point to and discuss in depth
- Strong hands-on experience with iOS (Swift) and/or Android (Kotlin); experience with React Native or other cross-platform frameworks, and familiarity with all
- Experience building mobile SDKs or shared libraries, including API design, versioning, packaging, and long-term maintenance across platforms
- Experience with blockchain-enabled mobile systems, including wallet flows, signing, and on-chain interactions
- Experience working on security-sensitive mobile software, such as key management, secure storage, cryptography, or financial products
- Strong grasp of mobile engineering best practices, including CI/CD, automated testing, release management, and observability
- A get-things-done mindset with the ability to independently own problems and deliver end-to-end solutions
- Comfortable making long-term architectural decisions while remaining pragmatic and adaptable
- B.Sc. in Computer Science / Engineering or equivalent practical experience
- Remote role in a distributed team; preference for candidates in the Americas time zone
- Rust and/or WebAssembly (Wasm) experience, particularly building cross-platform SDKs consumed by mobile apps
- Experience designing shared core logic used across iOS and Android
- Experience with advanced mobile security primitives (secure hardware, MPC, low-level crypto)
- Prior experience owning or founding a mobile platform or SDK from scratch
Company Overview
Fireblocks is a blockchain security service provider for moving, storing, and issuing digital assets. It was founded in 2018, and is headquartered in New York, New York, USA, with a workforce of 501-1000 employees. Its website is https://www.fireblocks.com.Company H1B Sponsorship
Fireblocks has a track record of offering H1B sponsorships, with 2 in 2026, 4 in 2025, 1 in 2024, 4 in 2023, 3 in 2022. Please note that this does not guarantee sponsorship for this specific role.